<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->
      <template v-else>
        <!-- 加载完成-文章详情 -->
        <div class="article-detail" v-if="article.title">
          <!-- 文章标题 -->
          <h1 class="article-title">{{ article.title }}</h1>
          <!-- /文章标题 -->

          <!-- 用户信息 -->
          <van-cell class="user-info" center :border="false">
            <van-image
              class="avatar"
              slot="icon"
              round
              fit="cover"
              :src="article.aut_photo"
            />
            <div slot="title" class="user-name">{{ article.aut_name }}</div>
            <div slot="label" class="publish-date">
              {{ article.pubdate | relativeTime }}
            </div>
            <follow-user
              v-model="article.is_followed"
              :user-id="article.aut_id"
            ></follow-user>
          </van-cell>
          <!-- /用户信息 -->
          <!-- 文章内容 -->
          <div
            ref="article-content"
            class="article-content markdown-body"
            v-html="article.content"
          ></div>
          <!-- <div style="width:100px;height:1000px;background-color:pink;"></div> -->
          <van-divider>正文结束</van-divider>
          <comment-list :source="article.art_id" @update-total-count="totalCount = $event" ref="commentListRef" :list="commentList"  @reply-click="onReply"></comment-list>
        </div>
        <!-- /加载完成-文章详情 -->
        <template v-else>
          <!-- 加载失败：404 -->
          <div class="error-wrap" v-if="errorStatus === 404">
            <van-icon name="failure" />
            <p class="text">该资源不存在或已删除！</p>
          </div>
          <!-- /加载失败：404 -->
          <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
          <div class="error-wrap" v-else>
            <van-icon name="failure" />
            <p class="text">内容加载失败！</p>
            <van-button class="retry-btn">点击重试</van-button>
          </div>
          <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
        </template>
      </template>
    </div>

    <div class="article-bottom" v-if="article.title">
      <van-button class="comment-btn" type="default" round size="small" @click="isPostShow = true"
        >写评论</van-button
      >
      <van-icon name="comment-o" :info="totalCount" color="#777" />
      <collect-article v-model="article.is_collected" :article-id="article.art_id"></collect-article>
      <like-article v-model="article.attitude" :article-id="article.art_id"></like-article>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <van-popup v-model="isPostShow" position="bottom">
      <comment-post :target="article.art_id" @post-success="onPostSuccess"></comment-post>
    </van-popup>
    <van-popup v-model="isReplyShow" position="bottom" style="height: 100%">
      <!--  -->
     <comment-reply :comment="currentComment" @close="isReplyShow = false" v-if="isReplyShow"></comment-reply>
    </van-popup>
  </div>
</template>

<script>
// eslint-disable-next-line no-unused-vars
import { getArticleById } from '@/api/article'
import 'github-markdown-css/github-markdown.css'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user/index.vue'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticle from '@/components/like-article/index.vue'
import CommentList from './components/comment-list.vue'
import CommentPost from './components/comment-post.vue'
import CommentReply from './components/comment-reply.vue'
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReply
  },
  provide () {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data () {
    return {
      // 方式1.把数据定义好
      article: {
        // is_collected: false
      },
      loading: true, // 是否加载中
      errorStatus: null, // 是否有错误
      followLoading: false,
      totalCount: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: null // 当前评论
    }
  },
  computed: {},
  watch: {},
  async created () {
    try {
      const { data: { data } } = await getArticleById(this.articleId)
      this.article = data
      // 方式2.定时器执行代码
      setTimeout(() => {
        this.imgHtmlPreview()
      }, 0)
    } catch (e) {
      if (e && e.response && e.response.status === 404) {
        this.errorStatus = 404
      } else {
        this.errorStatus = 500
      }
      console.log(e)
    }
    this.loading = false
    console.log(4)
    // 方式1,异步执行代码
    // 注意:$nextTick一定要在改变变量之后,执行
    // this.$nextTick(() => {
    //   this.imgHtmlPreview()
    // })
  },
  mounted () {},
  methods: {
    onReply (comment) {
      // console.log(comment)
      this.currentComment = comment
      this.isReplyShow = true
    },
    onPostSuccess (data) {
      this.commentList.unshift(data.new_obj)
      this.isPostShow = false
    },
    imgHtmlPreview () {
      // 得到dom
      const imgs = this.$refs['article-content'].querySelectorAll('img')
      const images = []
      imgs.forEach((item, index) => {
        images.push(item.src)
        // 绑定事件
        item.onclick = function () {
          // 显示图片
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
